package com.book.service.impl;

import com.book.dao.BookDao;
import com.book.dao.OrderDao;
import com.book.dao.OrderItemDao;
import com.book.dao.impl.BookDaoImpl;
import com.book.dao.impl.OrderDaoImpl;
import com.book.dao.impl.OrderItemDaoImpl;
import com.book.pojo.*;
import com.book.service.OrderService;

import java.util.Date;
import java.util.Map;

public class OrderServiceImpl implements OrderService {
    private OrderDao orderDao=new OrderDaoImpl();
    private OrderItemDao orderItemDao = new OrderItemDaoImpl();
    private BookDao bookDao = new BookDaoImpl();
    @Override
    public String createOrder(Cart cart, Integer userId) {
        //订单号的唯一性，时间戳+用户id
        String orderId=System.currentTimeMillis()+""+userId;
        //创建一个订单对象
        Order order=new Order(orderId,new Date(),cart.getTotalPrice(),0,userId);
        //保存订单
        orderDao.savaOrder(order);
        //保存订单项

        //遍历购物车中每一个商品项保存到数据库
        for(Map.Entry<Integer, CartItem> entry : cart.getItems().entrySet()){
            //获取每一个购物车中的商品项
          CartItem cartItem=entry.getValue();
          //转换为每一个订单项
          OrderItem orderItem=new OrderItem(null, cartItem.getName(), cartItem.getCount(),cartItem.getPrice(),cartItem.getTotalPrice(),orderId);
          //保存订单项到数据库
          orderItemDao.saveOrderItem(orderItem);
          //更新库存和销量
            Book book = bookDao.queryBookById(cartItem.getId());
            book.setSales(book.getSales()+cartItem.getCount());
            book.setStock(book.getStock()-cartItem.getCount());
            bookDao.updateBook(book);

        }
        //清空购物车
        cart.clear();
        return orderId;
    }
}
